E=tc2

We
live in a 3-dimensional world, which physics calls "3-space." But there is also
spacetime,
or 4-space, or the "4th dimension." This amazing "new" knowledge is that time
itself is actually
compressed energy and is compressed by exactly the same factor by which matter
is considered
compressed energy: the speed-of-light-squared! So the famous E=mc2 now has a
no-longer-secret sister: E=tc2 (where t is actually "delta-t," or change in
time).